I can see that in the 2nd one and the 4th one, there is a gradient on the background. The left side is darker and not quite white.

The exposure on the model looks to be a bit low, the blacks are lost in shadow (on my monitor at least). The skin looks OK but could maybe stand a bit more exposure.

Click to expand...

I'm not sure why the gradiant is there, I made sure the back drop exposure was 1/2-1 full stop brighter compared to the model, I think my monitor is callabrated differently, the blacks look alright on my screen..but anyway, thank you!

The gradient is there because your background light was not perpendicular to the paper. Also, you might want your background to be more than a full stop brighter, for it to be truly white. If your model is mid toned, you might want up to 2 1/2 stops for pure white.

The gradient is there because your background light was not perpendicular to the paper. Also, you might want your background to be more than a full stop brighter, for it to be truly white. If your model is mid toned, you might want up to 2 1/2 stops for pure white.